JP2006084895A - Sector driving device, shutter apparatus provided with same, stop driving device, and light quantity control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sector driving device whose miniaturization can be realized, a shutter apparatus provided with the sector driving device, a stop driving device, and a light quantity control device. <P>SOLUTION: In the sector driving device comprising a base plate 11 on which a shutter aperture 25 is formed, a rotor shaft 13 projected from the base plate 11, a first arm 12 fixed to the rotor shaft 13, a second arm 15 oscillatably fitted to a support shaft 17 projected from the base plate 11 and having a first oblong hole 16 formed so as to be engaged with a first operation pin erected on the first arm 12, and a sector 20 having a second oblong hole 16 formed so as to be engaged with a second operation pin 18 erected on the second arm 15, the rotor shaft 13 is arranged on the center side in the width direction of the base plate 11 against the support shaft 17 and the second operation pin 18 and the first oblong hole 16 is extended in the same direction as the longitudinal direction of the second arm 15. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sector driving device, a shutter device including the sector driving device, an aperture driving device, and a light amount adjusting device.

2. Description of the Related Art Conventionally, a sector drive device (in particular, also referred to as a light amount adjusting device) that is equipped with an ND filter and can adjust the amount of light has a ground plate (also referred to as a shutter substrate) provided with an opening and an ND filter. A holding frame (which may be a sector), a meter, and an arm attached to a rotation shaft (also referred to as a rotor shaft) of the meter and engaged with the holding frame. It is comprised so that it may advance / retreat with respect to an opening part (for example, refer patent document 1 shown below).
JP 11-29596 A

  However, in the above-described prior art, there is a problem that the size of the apparatus increases because the holding frame or sector protrudes from the base plate when retracted from the opening. Also, when the holding frame or sector protrudes from the ground plane, there may be a problem that it collides with an external device.

  Accordingly, the present invention has been made in view of the above problems, and an object thereof is to provide a sector drive device that can be reduced in size, a shutter device including the sector drive device, an aperture drive device, and a light amount adjustment device.

In order to achieve such an object, a sector drive device according to the present invention is attached to the rotor shaft, a ground plate provided with an opening, a rotor shaft that rotates in accordance with the operation of the motor, and the rotor shaft. A first arm, a second arm that is swingably attached to the base plate, and engages with a first operating pin provided on the first arm; and a second operating pin provided on the second arm. And having a sector to perform. By dividing the arm for driving the sector into two, the degree of freedom of arrangement of the arm is improved, and the arm can be configured not to protrude from the main plate when the arm swings. Moreover, since the freedom degree of arrangement | positioning of a rotor axis | shaft and a motor improves, a motor can be arrange | positioned as close as possible to the opening of a ground plane, and size reduction of an apparatus is realizable.
Further, in the sector drive device according to claim 1, for example, as in claim 2, the second arm has a first elongated hole that engages with the first operating pin, and the first elongated hole is You may be comprised extending | stretching along the longitudinal direction of a 2nd arm. By extending the first elongated hole in the same direction as the longitudinal direction of the second arm, the swing range of the first arm can be widened, and the swing angle of the second arm can be increased, thereby driving the sector. The amount can be increased.

  Further, in the sector drive device according to claim 1 or 2, the first elongated hole is provided between the swing center of the second arm and the second operating pin, for example, as in claim 3. May be. As a result, the swing angle of the second arm with respect to the swing angle of the first arm can be increased, and consequently the drive amount of the sector can be increased.

  In the sector drive device according to any one of claims 1 to 3, the second arm may be configured to be longer than the first arm, for example, as described in claim 4. By making the second arm longer than the first arm, it is possible to increase the swing range of the second arm with respect to the swing angle of the first arm, thereby increasing the drive amount of the sector.

  In addition, the sector drive device according to any one of claims 1 to 4 includes, for example, a guide that is provided along the drive direction of the sector and sandwiches the sector. May be configured. By providing the guide so as to sandwich the sector, the movement range of the sector can be limited, and the sector can be prevented from protruding from the ground plane. Further, by providing the guide along the sector driving direction, the sector can be driven smoothly.

  Further, in the sector drive device according to claim 5, for example, as in claim 6, the guide has a plurality of protrusions that come into contact with the sector, and the plurality of protrusions are provided for each side of the sector. You may comprise so that at least 2 or more may always contact | abut. Providing the guide with a projection that contacts the sector can reduce the contact area with the sector and reduce the friction generated when the sector moves. In addition, it is possible to prevent the sector from wobbling by configuring so that at least two or more protrusions always come into contact with one side of the sector.

  The sector drive device according to a sixth aspect of the present invention may be configured such that, for example, the sector has a leg portion that extends in the drive direction and abuts against the protrusion. That is, by configuring the side along the guide in the sector to be long, the number of protrusions provided on the guide can be reduced.

  A shutter driving device according to the present invention includes the sector driving device according to any one of claims 1 to 7, as described in claim 8. Thereby, it is possible to realize a shutter driving device that can be miniaturized.

  According to a ninth aspect of the present invention, there is provided the diaphragm driving device including the sector driving device according to any one of the first to seventh aspects, wherein the sector is smaller than the shutter opening. It is configured to have an opening. As a result, it is possible to realize an aperture driving device that can be miniaturized.

  According to a tenth aspect of the present invention, there is provided a light amount adjusting device including the sector driving device according to any one of the first to seventh aspects, wherein the sector is an opening, and the opening is formed in the opening. And a light amount adjustment filter provided. Thereby, the light quantity adjustment device which can be reduced in size is realizable.

  According to the present invention, it is possible to realize a sector drive device that can be miniaturized, a shutter device including the sector drive device, an aperture drive device, and a light amount adjustment device.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  First, Embodiment 1 according to the present invention will be described in detail with reference to the drawings. 1 and 2 are diagrams showing the configuration of the sector drive apparatus 10 according to the present embodiment. 1 shows a configuration in which the shutter opening 25 is in a fully open state, and FIG. 2 shows a configuration in which the shutter opening 25 is in a fully closed state.

  As shown in FIG. 1 and FIG. 2, the sector drive device 10 includes a base plate 11 provided with a shutter opening 25, a sector 20 having an opening 21 that is at least one size larger than the opening 25, and the sector 20 as a shutter opening. And a pair of arms (first arm 12 and second arm 15) that move forward and backward with respect to 25.

  The base plate 11 is provided with a shutter opening 25 at substantially the center and has a substantially rectangular shape. In the base plate 11, motors (not shown) for driving the first and second arms 12 and 15 are arranged between the shutter opening 25 and the outer peripheral side surface and in the longitudinal direction of the base plate 11 from the shutter opening 25. The rotor shaft 13 protrudes therefrom. The rotor shaft 13 is provided closer to the center side in the width direction of the main plate 11 than a support shaft 17 and a second operating pin 18 which will be described later. That is, in this embodiment, the motor is provided near the center in the width direction of the main plate 11. Thereby, since the motor is disposed as close as possible to the shutter opening 25, the motor can be prevented from protruding from the main plate 11, and the apparatus can be reduced in size.

  Further, a guide 23 is provided on the outer peripheral portion of the base plate 11 along the longitudinal direction (drive direction of the sector 20). On the inner peripheral side surface of the guide 23, a plurality of protrusions 24 that abut on the side surface of the sector 20 are provided. That is, the guide 23 and the protrusion 24 play a role of correcting the drive range of the sector 20. In addition, the guide 23 is provided up and down in the drawing so as to sandwich the sector 20. Further, the protrusion 24 contacts the sector 20 at least two points in one guide 23, and a total of four or more points in total. Thereby, the wobbling of the sector 20 can be prevented.

  In the main plate 11, the rotation axis of the second arm 15 is positioned between the rotor shaft 13 and the long side surface of the main plate in a position substantially perpendicular to the moving direction of the sector 20 with respect to the rotor shaft 13. A supporting shaft 17 is provided. The support shaft 17 is fitted into a round hole provided at one end of the second arm 15. Thus, the second arm 15 is swingably attached to the main plate 11 around the support shaft 17. The second arm 15 is provided with a first elongated hole 16 (also referred to as a cam hole) that extends in the same direction as the longitudinal direction of the second arm 15.

  One end of the first arm 12 is fitted to the rotor shaft 13 of the motor, and is fixed to be rotatable about the rotor shaft 13 in accordance with the rotation of the rotor shaft 13. A first operating pin 14 for driving the second arm 15 is provided at the other end of the first arm 12. The first operating pin 14 is slidably engaged with the first elongated hole 16 of the second arm 15.

  The second arm 15 is longer than the first arm 12, and is engaged with a round hole into which the support shaft 17 of the base plate 11 is fitted at one end and a second long hole 19 provided in the sector 20 at the other end. A second actuating pin 18 to be joined and a first elongated hole 16 for engaging the first actuating pin 14 of the first arm 12 between one end and the other end. Therefore, the second arm 15 swings a predetermined angle about the support shaft 17 in accordance with the swing of the first arm 12. In addition, by making the second arm 16 longer than the first arm 12, the swing angle of the second arm 15 with respect to the swing angle of the first arm 12 can be increased. Further, the first long hole 16 is located closer to the support shaft 17 than the central portion of the second arm 15. As a result, the swing range of the second arm 15 relative to the swing angle of the first arm 12, particularly the swing range of the second operating pin 18, can be increased. Further, the first long hole 16 extends in the axial direction of the second arm 15. Thus, by extending the first elongated hole 16 in the same direction as the longitudinal direction of the second arm 15, the swing range of the first arm 12 can be widened, and the swing angle of the second arm 15 can be increased. Is possible.

  Further, the rotation range of the first arm 12 configured as described above is limited by the first elongated hole 16 of the second arm 15, and can be swung by a predetermined angle about the rotor shaft 13. Further, the first and second arms 12 and 15 are configured to swing within a range that does not protrude from the main plate 11.

  The sector 20 includes an ND (Neutral Density) filter 22 attached to the opening 21, a second long hole 19 provided on the outer peripheral portion on the motor side, and engaged with the second operating pin 18 of the second arm 15. The shutter opening 25 of the base plate 11 is opened and closed by sliding in a predetermined direction (in the present embodiment, the longitudinal direction of the base plate 11) according to the swing of the second arm. The second slot 19 provided in the sector 20 extends in a direction orthogonal to the moving direction of the sector 20. Further, in the sector 20, the two leg portions 26 and 27 extend in the moving direction of the sector 20 so as to sandwich the shutter opening 25 at a position retracted from the shutter opening 25 of the base plate 11.

  Next, the operation of the sector drive device 10 will be described. When the rotor shaft 13 rotates according to the operation of the motor, the first arm 12 swings around the rotor shaft 13 in conjunction with the rotation. As a result, the second arm 15 having the first operating pin 14 engaged with the first elongated hole 16 swings about the support shaft 17. When the second arm 15 swings, the sector 20 in which the second operating pin 18 is engaged with the second long hole 19 slides along the guide 23 in conjunction with the swing. Thereby, the shutter opening 25 of the main plate 11 is opened and closed.

  The state shown in FIG. 1 is a state in which the first arm 12 is fully rotated in the right direction. In this state, the sector 20 is in the retracted position and the shutter opening 25 is fully opened. On the other hand, the state shown in FIG. 2 is a state in which the first arm 12 is rotated fully to the left. In this state, the sector 20 overlaps the shutter opening 25. Thereby, the opening 21 provided in the sector 20 is positioned on the shutter opening 25. Since the opening 21 is larger than the shutter opening 25 and is covered with the ND filter 22 that is a light amount adjusting filter, the amount of light incident on the shutter opening 25 is limited. That is, the light amount adjustment is performed.

With the configuration and operation as described above, according to the present embodiment, since the two arms 12 and 15 are driven in conjunction with each other, the degree of freedom of arrangement of the arms 12 and 15 is improved. As a result, it is possible to prevent the arms 12 and 15 from protruding from the base plate 11 during driving without increasing the size of the base plate 11, and to realize downsizing of the apparatus.
Further, since the degree of freedom of the arrangement of the rotor shaft 13, that is, the motor is improved, the motor can be arranged as close as possible to the shutter opening 25, and the apparatus can be downsized. More specifically, when the sector 20 is driven by only one arm (second arm 15 in FIG. 1) as in the prior art, the rotor shaft is disposed at the position of the support shaft 17, and the motor is connected to the base plate 11. It will stick out. On the other hand, since the first arm 12 is provided in addition to the second arm 15 in this embodiment, the motor can be disposed as close as possible to the shutter opening 25 by appropriately arranging the first arm 12. The device can be downsized.
Further, by providing the guide 23 on the ground plane 11, it is possible to prevent the sector 20 from protruding from the ground plane 11 when the sector 20 is driven. Furthermore, since the protrusion 24 is provided on the guide 23 and abuts the sector 24, friction during movement of the sector 20 can be reduced. Furthermore, by providing the leg portions 26 and 27 on the sector 20, it is possible to reduce the number of protrusions 24 provided on the guide 23, and as a result, it is possible to further reduce friction when the sector 20 moves.

  In addition, the said Example 1 is only an example for implementing this invention, This invention is not limited to these, It is in the scope of the present invention to modify these Examples variously, and It is obvious from the above description that various other embodiments are possible within the scope of the present invention. For example, in the present embodiment, the sector drive device 10 is configured as a light amount adjusting device by providing the sector 21 with the opening 21 and attaching the ND filter 22 thereto. However, the present invention is not limited to this, and the sector 21 is not provided. The driving device 10 may be configured as a shutter driving device. In addition, the sector driving device 10 may be configured as an aperture driving device by providing a small aperture opening (an opening smaller than the shutter aperture 25) in the sector 20.

It is a figure which shows the structure of the sector drive device 10 by Example 1 of this invention, and is a figure which shows the structure in which the sector 20 is a full open state. It is a figure which shows the structure of the sector drive device 10 by Example 1 of this invention, and is a figure which shows the structure in which the sector 20 is in a fully-closed state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Sector drive device 11 Ground plate 12 1st arm 13 Rotor shaft 14 1st operation pin 15 2nd arm 16 1st long hole 17 Support shaft 18 2nd operation pin 19 2nd long hole 20 Sector 21 Opening part 22 ND filter 23 Guide 24 Projection 25 Shutter opening 26, 27 Leg

Claims (10)

A main plate with an opening;
A rotor shaft that rotates according to the operation of the motor;
A first arm attached to the rotor shaft;
A second arm that is swingably attached to the base plate and engages with a first operating pin provided on the first arm;
A sector drive device comprising: a sector that engages with a second operating pin provided on the second arm. The second arm has a first slot that engages with the first operating pin;
2. The sector drive device according to claim 1, wherein the first elongated hole extends along a longitudinal direction of the second arm.   3. The sector drive device according to claim 1, wherein the first elongated hole is provided between a swing center of the second arm and the second operating pin. 4.   4. The sector drive device according to claim 1, wherein the second arm is longer than the first arm. 5.   5. The sector drive device according to claim 1, further comprising a guide provided along the drive direction of the sector so as to sandwich the sector. The guide has a plurality of protrusions that contact the sector,
6. The sector drive device according to claim 5, wherein at least two of the plurality of protrusions are always in contact with each side of the sector.   The sector drive device according to claim 6, wherein the sector has a leg portion that extends in the drive direction and contacts the protrusion.   A shutter drive device comprising the sector drive device according to claim 1. An aperture drive device comprising the sector drive device according to any one of claims 1 to 7,
The aperture driving device according to claim 1, wherein the sector has an opening smaller than the opening. A light amount adjusting device comprising the sector drive device according to any one of claims 1 to 7,
The light quantity adjusting device, wherein the sector has an opening and a light quantity adjusting filter provided in the opening.

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